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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1ec8deeb4973774d765586140846a0a1629922538ef4ea445c1ec615bf8d71' 
  AND token = 'aLzAmTVFcK2RxIRAGh2GXIRK0ENt2w/Zl3xDWd36/P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}